Rebounding hammer.



G. S. LEWIS.

REBOUNDING HAMMER.

APPLIOATION FILED JAN.21,1913.

1,070,145. Patented Aug. 12, 1913.

Att st: W lm entor:

I by v M w w W @Mhia invrrnn srrrrns rarEEr oEEicE GEORGE S. LEWIS, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO J. STEVENS ARMS c TOOL COMPANY, OF CHICOPEE FALLS, MASSACHUSETTS, A CORPORATION OF MAS- SACHUSETTS.

REBOUNDING HAMMER.

Specification of Letters Patent.

Patented Aug. 12,1913.

To all whom it may concern:

s Be it known that I, GEORGES. Lnwis, a citizen of the United States, residing in Springfield, Hampden county, State of Massachusetts, have invented certain new and useful Improvements in Rebounding Hammers, of which the following is a specification, reference being had to the accompanying drawings, which form a part hereof.

This invention relates to rebounding hammers designed primarily with reference to their use in single-shot firearms of low cost.

It has for an object to provide an efficient rebounding hammer which shall not be unduly heavy and which shall operate with unvarying certainty to explode the cartridge.

It has for further object to improve generally the construction of such devices and to eliminate certain undesirable features which have appeared in prior constructions.

In the usual arrangement, with a coiled main spring, the spring plunger acts on a pin on one side of the hammer pivot to throw the hammer down, and during the last part of the travel of the latter acts on a pin on the other side of the hammer pivot to cause the hammer to rebound. In this construction the hammer, at the end of its stroke, moves against the tension of the main spring and so the force of the blow is reduced and often insufficient to explode the cartridge. In accordance with the presentinvention this disadvantage is removed by having the hammer relieved of the action of the spring plunger during the latter part of its stroke and continue its movementsolely by its own momentum. The rebound of the hammer is then effected by suitable means independent of the main spring.

The invention will be described more particularly with reference to the accompanying drawings in which- Figure 1 is a fragmentary view partly in section of a firearm provided with a hammer constructed in accordance with the invent-ion, the hammer being shown in full lines in cocked position. Fig. 2 is a similar view showing the hammer half-cocked.

The gun herein illustrated comprises a frame a. and barrel Z) of usual construction ith a hammer c pivotally mounted as at cl in the frame and in operative relation with respect to the usual firing pin a. The general configuration of the hammer c is unchanged in the present invention, the usual half cock notch c and full cock notch 0 being provided to cooperate with the com bined scar and trigger e which is engaged by a leaf spring f secured to the gun frame by a screw f. vThe rear face of the hammer 0 is notched as at c to receive and guide the coiled main spring and spring plunger g. The construction thus far set forth is known in the art, and the foregoing description it is believed, is sufficient for a clear understanding of the particular improvements which constitute the subject matter of this invention and which will now be described. The head g of the spring plunger 9 has its upper forward edge in engagement with the notch c of the hammer 0 while the under face of the head 9' is slotted as at g to straddle the hammer. The vertical edges of the head g adjacent the slot 5/ are formed to engage the pivot pin (Z at a predetermined time with respect to the travel of the hammer 0 to limit positively further movement of the spring plunger g. To prevent a sliding movement of the head g on the pivot pin (Z the vertical edges of the head g are preferably concaved as indicated in dotted lines in Fig. 2. As appears in the same figure, the engagement of the forward edges of the head 9 with the pivot pin d may, and preferably does, occur at about the time that the hammer is in its normal half-cooked position. The throw of the hammer c after it is relieved from the action of the spring plunger 7 in the manner indicated above, continues solely by its own momentum. The rebound of the hammer after the cartridge has exploded is brought about by the engagement of the sear with a cam surface 0 formed on the hammer 0 at a point just above the halfcock notch 0. This movement, it will be understood, is initiated by the leaf spring 7 acting on the trigger a.

In operation, the hammer is retracted against the tension of the main spring until the sear engages the full cock notch 0 when the parts assume the position indicated in Fig. 1. Vhen the trigger is pressed so as to disengage the sear and the hammer, the latter isthrown forward under the influence of the spring plunger 9. The effective action of the latter on the hammer continues until the forward edges ofthe;head 9 en- I gage the pivot pin d when the hammer continues its forward movement solely under its own momentum. The last portion of the travel of the hammer accordingly is not attended with a counteraction on the part of the main spring or auxiliary springs as in previous constructions and the force of the hammer accordingly remains undiminislied.

After the delivery of the blow of the hammer on the firing pin, the trigger is relieved from the pressure of the finger so that the spring f is free to move the sear along the cam surface a with a force sufiicient to rock the hammer rearwardly until the searenters the half-cock notch 0. This rearward movement of the" hammer, 'wvhi'ch in",pract i oe amounts to a reboiihd of the same, per fect'ly free, since the spring plunger 9 is held in its arrested position bythe pivot pin (Z1 I claim as my invention: i

1. In a firearm the combinatipn of a m a hammer i fa ly'm ii dflereiu and a springplunger in operative engagenient'thereivith havinga slotted headto straddle the sa1ne,'the hammer pivot disposed the 'patliofthe plunger head to l arrest the movement ofthe plunger during the throw of the hammer.

2. In a firearm the combination of a frame, a hammer pivotally mounted therein, a spring plunger in operative engagement therewith having a slotted head to straddle the same, the hammer pivot being disposed in the path of the plunger head to arrest the movement of the plunger during the throw of ,the hammer, and means to move the hammer to half-cocked position after firing.

3. In a firearm the combination of a frame, a hammer pivotally mounted therein, a s gjring plunger in operative engagement therewith having a slotted head to straddle the same, the hammer pivot being disposed in the path of the plunger head to arrest the movementof the plunger during the throw of the hammer, and a spring pressed sear to cooperate With said hammer to move the same half-cocked position after firing.

This specification signed and witnessed this 16th day of January A. D., 1913.

GEORGE S. LEWVIS. Signed in the presence of ApeERT F. ,C OW H R, CHARLES LQ ELAN 992m i a ent EFQY be areae 2 ii-if it i an, a addmeing iqmmissmm Patents e e le ei P- 

